1: Either use manuf ratio or turn input shaft and record output turns.
2: RPM is reduced by the ratio of the reduction
3: Torque is increased by the ratio of the reduction, (motor to load inertia ratio is reduced by the square of the reduction)..
4: Depends on preferred motor technology, Stepper motor, brushed DC, BLDC will all perform this application.
5: The load and unload torque requirements of the load have to be known, this will also be dependent on the required accel/decel of the motor.
There are free sizing programs that can assist in getting an idea for motor sizing with Pgms such as offered by Kollmorgen site.
Max.